Classifications

• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
  • C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
  • C09C1/28—Compounds of silicon
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
  • C09K23/00—Use of substances as emulsifying, wetting, dispersing, or foam-producing agents
  • C09K23/002—Inorganic compounds
• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
  • D21H19/00—Coated paper; Coating material
  • D21H19/36—Coatings with pigments
  • D21H19/38—Coatings with pigments characterised by the pigments
  • D21H19/40—Coatings with pigments characterised by the pigments siliceous, e.g. clays
• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
  • D21H19/00—Coated paper; Coating material
  • D21H19/36—Coatings with pigments
  • D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
  • D21H19/56—Macromolecular organic compounds or oligomers thereof obtained by reactions only involving carbon-to-carbon unsaturated bonds
  • D21H19/58—Polymers or oligomers of diolefins, aromatic vinyl monomers or unsaturated acids or derivatives thereof
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K9/00—Medicinal preparations characterised by special physical form
  • A61K9/14—Particulate form, e.g. powders, Processes for size reducing of pure drugs or the resulting products, Pure drug nanoparticles
  • A61K9/16—Agglomerates; Granulates; Microbeadlets ; Microspheres; Pellets; Solid products obtained by spray drying, spray freeze drying, spray congealing,(multiple) emulsion solvent evaporation or extraction
  • A61K9/1682—Processes
  • A61K9/1694—Processes resulting in granules or microspheres of the matrix type containing more than 5% of excipient
• • C—CHEMISTRY; METALLURGY
  • C01—INORGANIC CHEMISTRY
  • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
  • C01P2006/00—Physical properties of inorganic compounds
  • C01P2006/12—Surface area
• • C—CHEMISTRY; METALLURGY
  • C01—INORGANIC CHEMISTRY
  • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
  • C01P2006/00—Physical properties of inorganic compounds
  • C01P2006/22—Rheological behaviour as dispersion, e.g. viscosity, sedimentation stability
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
  • C09K23/00—Use of substances as emulsifying, wetting, dispersing, or foam-producing agents

Definitions

• the present invention relates to a novel method for suspending talc in water from a polymeric additive for producing aqueous talc suspensions having a compromise never before equaled between a high solids content and improved stability. , and a reduced dispersant dose. This result is all the more interesting because we know the many applications of aqueous suspensions of talc, and the difficulty to suspend in water this particularly hydrophobic mineral.
• Talc is a mineral used in many applications. In the paper industry it is used especially as a filler, but can also be used in coating sauces, or as an additive to reduce the amount of stickies (pitch or stickies) in the paper process; it is also used in paints, in plastics and filled rubbers, in ceramics, and in food compositions, cosmetics and even in agriculture.
• the talc can be transported in powder form, but it is also suspended in water for questions related to the ease of transport, unloading and transfer of a liquid product unlike a powdery product. In addition, fine powders also represent a danger to humans, if they are inhaled too much.
• the Applicant states that the talc suspending step in question may optionally be preceded by a granulation step, the latter consisting in agglomerating individual particles of talc so as to form a wet granule.
• talc is a highly hydrophobic substance with a surface energy in the range of 68 to 70 J / cm. Therefore, suspending a significant amount of this mineral in water, without achieving viscosity levels that would render the suspension unsuitable for storage or handling, represents a technical challenge for those skilled in the art. This is particularly reported in The document "The importance of surface energy in the dispersion of particles in aqueous media" (Powder Technology, 2009, 190 (1-2), pp. 242-246).
• dispersing agents introduced during the step of suspending talc in water, and / or during the possible granulation step which precedes it.
• JP 63-175197 which recommends the implementation of acrylic polymers mixed with polylakylene glycol esters.
• a suspension of a solids content close to 60% is obtained; its rheological behavior is studied through a pass test in a sieve; an easy and fast flow of the suspension is observed for a mesh of the sieve equal to 150 ⁇ .
• the dose of dry dispersant used is around 10% by weight relative to the dry weight of talc: the performance must therefore be relativized with respect to this high amount of dispersant.
• JP 02-253836 recommends the use of a (meth) acrylic copolymer in combination with a sulphosuccinic acid. Even if a dry extract of 65% is obtained for a Brookfield TM viscosity at 100 rpm of between 300 and 680 mPa.s, the proportion of dispersant comprised between 2 and 3% by dry weight relative to the dry weight of talc. can not satisfy the skilled person. Also known is FR 2 380 065 A1 which discloses aqueous suspensions of talc with solids greater than 65, and Brookfield TM viscosities at 100 rpm of the order of 1000 mPa.s.
• the examples demonstrate that the amount by dry weight of dispersant must be greater than 1% of the dry weight of talc, preferably of the order of 3%.
• the dispersant used is a phenol salt, and more particularly an alkyl phenol.
• these substances are now prohibited in industry, especially in aqueous paints, which are one of the potential applications of aqueous suspensions of talc.
• US 6 267 811 A1 and WO 2010 055191 A1 are also known which recommend implementing a CMC (carboxymethyl cellulose) / sodium polyacrylate system.
• the level of performance achieved by this couple remains modest, however, in terms of the rheology of the suspension as a function of its dry extract.
• this solution has the disadvantage of using two components, which multiplies by the storage facilities and transfer (the modified cellulose acts here as a wetting agent).
• a variant of the previous solution lies in the implementation of a sodium polyacrylate with a surfactant (GB 2,019,822). If the characteristics of the resulting aqueous suspension of talc are improved in the sense of the present invention, then the formation of a very abundant foam is observed, a factor extremely harmful to the final application, the foam resulting from the presence of the surfactant free form in water. It is indicated that the 2 polyacrylate / CMC and polyacrylate / surfactant technical solutions have been compared in the present application.
• n and n denoting integers less than or equal to 100, at least one of which is non-zero
• EO and OP respectively denoting ethylene oxide and propylene oxide, R denoting a polymerizable function, and preferably the methacrylate or methacrylurethane function,
• R 'de notes a linear or branched alkyl, alkylaryl, arylalkyl, aryl group having at least 22 carbon atoms or a dialkylamine having at least 22 carbon atoms.
• a first object of the invention consists in a method of manufacturing an aqueous suspension of talc, comprising a step of suspending in water a talc, said talc possibly resulting from a prior granulation step , characterized in that at least one water-soluble polymer is used during the suspending step and / or during the optional granulation step, characterized in that it consists of: a) from minus one (meth) acrylic monomer, and
• n and n denoting integers less than or equal to 115, at least one of which is not zero, - OE and OP respectively denoting ethylene oxide and propylene oxide, being arranged in a regular or random manner,
• Another subject of the present invention consists of an aqueous suspension of talc in water, characterized in that it contains at least one water-soluble polymer characterized in that it consists of: a) at least one monomer (meth ) acrylic, and
• R denoting a polymerizable function, chosen from acrylate, methacrylate, methacrylurethane, vinyl or allyl function,
• the process or the suspension is also characterized in that said water-soluble polymer consists of, expressed in% by weight of each of its monomers: a) at least 60% of at least one (meth) acrylic monomer,
• the integers m and n are non-zero and between 10 and 75.
• the integer n 0 and the integer m is between 10 and 115.
• the R 'function of the monomer of formula (I) represents hydrogen.
• said water-soluble polymer consists of, expressed in% by weight of each of its monomers: a) from 60% to 99% of at least one (meth) acrylic monomer, and
• said water-soluble polymer has a specific viscosity of between 1 and 50, as measured according to the method described in document EP 0 892 020 A1.
• specific viscosity in the meaning of the present invention is defined as the difference in relative viscosity measured at a predetermined temperature (eg 20 ° C or 25 ° C) minus 1.
• the relative viscosity can be defined by:
• the specific viscosity of the polymer may for example be determined by a Lauda PVS system on aqueous polymer solutions (polymer concentration determined, for example, of 45 g / l or 50 g / l).
• said water-soluble polymer is totally or partially neutralized, preferentially by sodium, calcium, potassium, magnesium or ammonium ions, or mixtures thereof.
• said suspension of talc in water contains between 0.001% and 2%, preferably between 0.1% and 1%, very preferably between 0.1% and 0.75%, by dry weight of said water-soluble polymer relative to the dry weight of talc.
• said suspension of talc in water contains more than 55%, preferably more than 60%, very preferably between 61% and 65% by dry weight of talc relative to its weight. total.
• Another object of the present invention resides in the use of said aqueous suspension to produce a paper coating color, an additive that makes it possible to reduce the quantity of tacky materials, a paint, a plastic, a rubber, a ceramic, a food composition. , a cosmetic composition, an agricultural formulation.
• a final subject of the present invention consists of a paper coating sauce, an additive that makes it possible to reduce the quantity of stickies, a paint, a plastic, a rubber, a ceramic, a food composition, a cosmetic composition, an agricultural formulation, characterized in that it contains a talc and a polymer as described above.
• This example relates to the suspension of a talc which is the Mistron 85 marketed by Talc de Luzenac TM. We have sought here to make suspensions having a solids solids content equal to 61% of their total weight.
• the pH is adjusted to 12 with 50% sodium hydroxide solution.
• the talc is then poured into the beaker, little by little.
• the stirring speed of the engine is then increased up to 2500 rpm.
• the suspension is allowed to cool to 25 ° C.
• the pH is again adjusted to 11 with 50% sodium hydroxide solution.
• the value of its Ford TM cutting viscosity is determined in seconds according to the method well known to those skilled in the art (ISO 2431-1984 standard using a Ford TM No. 4 cut).
• talc 0.1% by dry weight of a sodium polyacrylate with a weight average molecular weight of 3800 g / mol and 0.9% by dry weight of a surfactant (Lumiten TM PR8709 sold by the company BASF TM).
• a surfactant Liiten TM PR8709 sold by the company BASF TM.
• This test illustrates a field not belonging to the invention or to the prior art; it illustrates more precisely a solution as described in the document EP 0 892 020 A1, but with a surfactant monomer bearing a terminal hydrophobic group which is the linear alkyl group having 16 carbon atoms.
• additive means the system used to disperse (and stabilize the suspension) based on a polyacrylate / CMC or polyacrylate / surfactant couple or a surfactant polymer
• Tests Nos. 3, 4 and 5 which correspond to a polymer whose surfactant monomer has more than 22 carbon atoms on its terminal group, systematically lead to higher values of Ford TM cutting viscosity (more than 120 seconds). ) than for the polymers of the invention (less than 110 seconds).
• test no. 6 which illustrates the presence of an alkyl group having 16 carbon atoms in the surfactant monomer, leads to a value of cutting viscosity Ford TM equal to 131, which is also not satisfactory. .
• EXAMPLE 2 This example relates to the suspension of a floc purified talc which is Finntalc TM C10 marketed by Mondo Minerais TM.
• This example illustrates the ability of the dispersant according to the invention to suspend another type of talc than the previous one: it serves to illustrate the "universal" nature of said dispersant.
• the polymer or the polymer / CMC or polymer / surfactant system to be tested is then added (the amounts are indicated thereafter for each test).
• the pH of the solution is adjusted to 12 with 50% sodium hydroxide solution.
• the aqueous solution is introduced into a Lodige disperser; after switching on the mixer, the talc is gradually introduced into the disperser.
• the high shear turbine is then started and allowed to run for 1 hour by regulating the temperature of the suspension between 30 and 40 ° C.
• the suspension is then diluted to a solids content of 65% of talc. Its pH is adjusted to 10 by means of a 50% sodium hydroxide solution.
• the value of its Ford TM cutting viscosity is determined in seconds according to the method well known to those skilled in the art (ISO 2431-1984 standard using a Ford TM No. 4 cut).
• additive means the system used to disperse (and stabilize the suspension) based on a polyacrylate / CMC or polyacrylate / surfactant couple or a surfactant polymer
• Tests No. 15 and 16 which correspond to a polymer according to the invention lead to the Ford TM cutting viscosity values among the lowest, without causing the formation of foam, and with a low dose of dispersant.

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• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Dispersion Chemistry (AREA)
• Materials Engineering (AREA)
• Engineering & Computer Science (AREA)
• Inorganic Chemistry (AREA)
• Compositions Of Macromolecular Compounds (AREA)
• Paper (AREA)
• Cosmetics (AREA)
• Pigments, Carbon Blacks, Or Wood Stains (AREA)
• Paints Or Removers (AREA)
• Emulsifying, Dispersing, Foam-Producing Or Wetting Agents (AREA)

Applications Claiming Priority (2)

Publications (2)

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Family Applications (1)

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• 2011
  • 2011-10-26 FR FR1159694A patent/FR2981939B1/fr active Active
• 2012
  • 2012-10-08 BR BR112014009285A patent/BR112014009285A8/pt not_active IP Right Cessation
  • 2012-10-08 EP EP12781367.3A patent/EP2771413B1/de not_active Not-in-force
  • 2012-10-08 WO PCT/FR2012/052277 patent/WO2013060961A1/fr active Application Filing
  • 2012-10-08 CN CN201280052707.6A patent/CN103906813A/zh active Pending
  • 2012-10-16 US US13/652,537 patent/US9228087B2/en not_active Expired - Fee Related

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